It's been the biggest wet in many years so expect plenty of flies and mozzies et al. There will certainly be more standing water than there has been for quite a while and the Pentacost crossing may require a bonnet bra and some care if it is carrying a lot of water.

The best fly strategy in Outback Oz is to assume they will be bad.....then you at least have a chance to be pleasantly surprised :-). We always pack the plenty of the various goods to cater for that....fly repellent (I prefer cream types), fly nets for your hat etc....maybe a sizeable mozzie net or two, if tenting. We always have plenty of the burning mozzie repellent sticks and coils (cheap as) too. Just back on flies.....I think it was the CSIRO some years back explained how hard it was to predict what they might be like....expected plagues fail to materialise and then at other times they flourish in huge numbers (and....it's apparently got a lot to do with vegetation types as well....not just moisture). I thought animal dung played a big part, but apparently regions with no stock can still be horrendous). We have had "fun with flies" (not) on many trips but dropping in to the Breakaways once near Coober Pedy, for a coffee, may have been the worst....we were literally attacked and could not remain out of the car !

We were up there in June 2015 and were stunned by the lack of flies (we ate lunch on the Tanami one day on the journey up and swatted one fly the whole time). Our other days along the Gibb were very similar.
I wish you the same luck.
:)

Many thanks for everyone's relies.
I have all the precaution fly and mozzie gear needed, Flinders Ranges gets bad once mid to late September hits, cant cook or eat outside during the day, even worse if they had a wet Autumn/Winter.
I was worried after the recent record rainfall in the Kimberleys that it would bread the insects. I should be through by early to mid June and in Darwin for a few days then hit the Kakadu.
Thanks again.